Dischargeable Nickel Matrix Charges Iron Species for Oxygen Evolution Electrocatalysis

Sinwoo Kang,Jaeyoung Lee 한국표면공학회 2023 한국표면공학회 학술발표회 초록집 Vol.2023 No.11-1

Durable Nickel-Iron (Oxy) hydroxide Oxygen Evolution Electrocatalysts through Surface Functionalization with Tetraphenylporphyrin

Sinwoo Kang,Jaeyoung Lee 한국표면공학회 2023 한국표면공학회 학술발표회 초록집 Vol.2023 No.11-1

적외선 센서를 이용한 열화상태 무선감시 시스템 개발

김지희(Jihee Kim),김신우(Sinwoo Kim),강용수(Yongsoo Kang) 대한전자공학회 2013 전자공학회논문지 Vol.50 No.1

발전소 내 고압 단자대 및 전력구 케이블 인입부에서 주변 전력기기들의 지속적인 진동 및 순간적인 충격의 발생으로 케이블 단자 또는 접속부 접촉점에 열화가 발생하는 사고가 일어난다. 접촉점에서의 열화 발생은 큰 사고로 이어질 수 있으며 안정적으로 전력을 공급해야 하는 발전소에서는 열화 발생을 예측하기 위한 다양한 연구가 시도되고 있다. 이에 비접촉식 적외선 센서를 이용하여 온도를 측정하는 방식이 있으며 이러한 방식의 궁극적인 목적은 측정하고자 하는 대상체를 최적의 거리에서 감시함으로 접촉점의 열화 발생뿐 아니라 센서 측정범위 내의 열화의 상태도 감시하는 데 있다. 연결부 온도를 측정하고 열화 상태를 실시간 감시하여 사용자에게 가시, 가청 알람을 주어 사용자가 열화사고를 인지하여 미연에 방지할 수 있게 한다. 그러나 이러한 시스템을 구축하기 위해서는 감시 장치를 설치, 운영해야 하는 어려움이 있다. 본 연구에서는 설치 용이성을 고려하여 소출력 배터리 동작모듈로 접속부의 온도를 측정하고 이를 감시할 수 있는 적외선센서를 이용한 무선감시시스템을 개발하였다. The temperature monitoring of power cable and cable junction point is the necessary link of the safe and reliable operation of the power system. Many kinds of cables and high voltage junction points are easy to exposed continuous vibrations and momentary impulse in industry field especially power plant industries. This system can predict the overheating of the electric cable interface and the possibility of all kinds of accident, and it helps for eliminating the hazards of electric cable interface and provides the effective guarantee for the safety operation. In order to avoid the faults of the inconvenience of installation and maintenance and the high cost of application, this system used small and contactless IR sensor module. The low power consumption is used in the system. The goal of this study is the low cost and on-line reliable monitoring of power cable and junction point temperature.

적외선 센서를 이용한 열화상태 무선감시 시스템 개발

김지희,김신우,강용수,Kim, Jihee,Kim, Sinwoo,Kang, Yongsoo 대한전자공학회 2013 전자공학회논문지 Vol.50 No.9

발전소 내 고압 단자대 및 전력구 케이블 인입부에서 주변 전력기기들의 지속적인 진동 및 순간적인 충격의 발생으로 케이블 단자 또는 접속부 접촉점에 열화가 발생하는 사고가 일어난다. 접촉점에서의 열화 발생은 큰 사고로 이어질 수 있으며 안정적으로 전력을 공급해야 하는 발전소에서는 열화 발생을 예측하기 위한 다양한 연구가 시도되고 있다. 이에 비접촉식 적외선 센서를 이용하여 온도를 측정하는 방식이 있으며 이러한 방식의 궁극적인 목적은 측정하고자 하는 대상체를 최적의 거리에서 감시함으로 접촉점의 열화 발생뿐 아니라 센서 측정범위 내의 열화의 상태도 감시하는 데 있다. 연결부 온도를 측정하고 열화 상태를 실시간 감시하여 사용자에게 가시, 가청 알람을 주어 사용자가 열화사고를 인지하여 미연에 방지할 수 있게 한다. 그러나 이러한 시스템을 구축하기 위해서는 감시 장치를 설치, 운영해야 하는 어려움이 있다. 본 연구에서는 설치 용이성을 고려하여 소출력 배터리 동작모듈로 접속부의 온도를 측정하고 이를 감시할 수 있는 적외선센서를 이용한 무선감시시스템을 개발하였다. The temperature monitoring of power cable and cable junction point is the necessary link of the safe and reliable operation of the power system. Many kinds of cables and high voltage junction points are easy to exposed continuous vibrations and momentary impulse in industry field especially power plant industries. This system can predict the overheating of the electric cable interface and the possibility of all kinds of accident, and it helps for eliminating the hazards of electric cable interface and provides the effective guarantee for the safety operation. In order to avoid the faults of the inconvenience of installation and maintenance and the high cost of application, this system used small and contactless IR sensor module. The low power consumption is used in the system. The goal of this study is the low cost and on-line reliable monitoring of power cable and junction point temperature.

대학생들은 플립드러닝수업을 통해 어떤 경험을 하는가?

임상훈 ( Sanghoon Im ),강수민 ( Sumin Kang ),이신우 ( Sinwoo Lee ),유영만 ( Yeong-mahn You ) 한국교육정보미디어학회(구 한국교육정보방송학회) 2016 교육정보미디어연구 Vol.22 No.4

본 연구는 대학에서 플립드 러닝 수업을 수강한 학생들의 학습 경험을 파악하기 위해 질적 연구로 수행되었다. 연구의 목적은 대학생들이 어떤 배경에서 플립드 러닝 수업을 선택하고, 온라인과 오프라인으로 구성된 각각의 수업을 학습하는 과정에서 어떠한 경험하는지 밝히는 것이다. 이에 플립드 러닝이 활성화 되어 있는 국내 A대학교를 사례로 하여, 플립드 러닝 수업을 들은 경험이 있는 학생 7명을 대상으로 심층면담, 온라인 커뮤니티를 관찰, 연구자의 성찰일지를 바탕으로 연구를 진행하였다. 연구결과 대학생들은 플립드 러닝 수업에 대해 잘 모르고 있으며, 학점 대비 수업시간이 짧다는 것에만 매력을 느꼈다. 수업형태라는 것에 별 관심이 없었다. 온라인 수업은 제 때 듣지 않거나, 복습용의 의미가 컸으며, 현장감의 부재를 체험했다. 오프라인 수업에서는 동료 학생들의 구성이 중요하며, 커뮤니케이션 능력이 향상되었고, 교수와 소통하는 기회가 많아졌다고 진술했다. 이러한 경험을 종합하면 중요한 것은 방법의 변화가 아니라 학습 그 자체였으며, 적극적인 학습자세가 필요했다. 아울러 온/오프라인 수업 간 유기적 연계가 중요했다. 이러한 결과를 바탕으로 대학에서 플립드 러닝 수업에 대한 시사점을 결론에 제시하였다. The study was conducted with qualitative research to inquire learning experiences of the students who were taking the flipped learning class. The purpose of this research was to investigate the learner`s background why they chose flipped learning class and what they experienced at the online and offline learning procedure. For this purpose, the study was proceeded in A domestic university which has active flipped learning courses. This study was done with in-depth interview focusing on 7 students who took the flipped learning class, observation for online community and researchers` reflection essay. As a result, college students considered that flipped learning class was similar learning method to e-learning and they were fascinated by short class time for the credit. One the on hand, learners of online lecture did not attend the class on time, considered it as review course, and experienced lack of realism. They also had a little interest in the learning type. On the other hand, learners stated that the composition of students was important offline lecture. Also, they said it helped them improve communication skills and made environment of interacting among teacher and peers. Summarizing these experiences, the most important factor was the learning itself and active learning attitude of students not the change of method. Moreover, interactive connection between online and offline courses was essential as well. Based on these findings, implications for flipped learning class on college were presented in the conclusion.

The comparison of muscle activity according to various conditions during smartphone use in healthy adults

Kim, You Lim,Yoo, Jaehyun,Kang, Sinwoo,Kim, Taerim,Kim, Namyeol,Hong, Sojeong,Hwang, Wonjeong,Lee, Suk Min korean Academy of Physical Therapy Rehabilitation 2016 Physical therapy rehabilitation science Vol.5 No.1

Objective: The purpose of this study was to see the changes in muscle activity of the upper limb in persons using a smartphone. Design: Cross-sectional study. Methods: An experiment was conducted to target 15 right-handed university students. Experiments were carried out for students using cell phones for more than a year. In this study, experiments were carried out with one-handed and both handed operation of smartphone use in a sitting position, the same parameters with smartphone use in a standing position. The experiments were carried out by having the subjects write a text message in Korean on the smartphone for 3 minutes repeated 3 times with a rest period of 10 seconds given between each 3 minute period. Electromyography (EMG) was used to record the muscle activity of the upper trapezius (UT), extensor carpi radialis (ECR), and abductor pollicis (AP) during phone operation. Results: The muscle activity of the AP and ECR were significantly higher during single handed compared to double handed in both sitting and standing position (p<0.05). The muscle activity of the ECR was significantly higher in standing position compared to sitting position with double handed use of the smartphone (p<0.05). UT muscle activity of the right has been activated more than twice compared to the left UT in a sitting position (p<0.05). And UT muscle activity on the right has been activated more than five times compared to the left in a standing position (p<0.05). Conclusions: Using smartphone with double hand is useful for the prevention of musculoskeletal disorders.

The comparison of muscle activity according to various conditions during smartphone use in healthy adults

( You Lim Kim ),( Jaehyun Yoo ),( Sinwoo Kang ),( Taerim Kim ),( Namyeol Kim ),( Sojeong Hong ),( Wonjeong Hwang ),( Suk Min Lee ) 물리치료재활과학회 2016 Physical therapy rehabilitation science Vol.5 No.1

Objective: The purpose of this study was to see the changes in muscle activity of the upper limb in persons using a smartphone. Design: Cross-sectional study. Methods: An experiment was conducted to target 15 right-handed university students. Experiments were carried out for students using cell phones for more than a year. In this study, experiments were carried out with one-handed and both handed operation of smartphone use in a sitting position, the same parameters with smartphone use in a standing position. The experiments were carried out by having the subjects write a text message in Korean on the smartphone for 3 minutes repeated 3 times with a rest period of 10 seconds given between each 3 minute period. Electromyography (EMG) was used to record the muscle activity of the upper trapezius (UT), extensor carpi radialis (ECR), and abductor pollicis (AP) during phone operation. Results: The muscle activity of the AP and ECR were significantly higher during single handed compared to double handed in both sitting and standing position (p<0.05). The muscle activity of the ECR was significantly higher in standing position compared to sitting position with double handed use of the smartphone (p<0.05). UT muscle activity of the right has been activated more than twice compared to the left UT in a sitting position (p<0.05). And UT muscle activity on the right has been activated more than five times compared to the left in a standing position (p<0.05). Conclusions: Using smartphone with double hand is useful for the prevention of musculoskeletal disorders.